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TDA2005
20W BRIDGE AMPLIFIER FOR CAR RADIO
TDA2005
20W BRIDGE AMPLIFIER FOR CAR RADIO
October 1998
BOOTSTRAP(1)
INPUT-(1)
SVRR
GND
INPUT-(2)
INPUT+(2)
OUTPUT(2)
+VS
OUTPUT(1)
INPUT+(1)
TAB CONNECTEDTOPIN6 D95AU318
BOOTSTRAP(2)
PIN CONNECTION
MULTIWATT11
ORDERING NUMBERS: TDA2005M (Bridge Appl.)
TDA2005S (Stereo Appl.)
High output power: PO=10+ 10 W@RL =2Ω,= 10%;PO= 20W@RL =4Ω,d=1 %.
High reliabilityof thechip and package with addi-
tional complete safety during operation thanksto
protection against:. OUTPUT DC AND AC SHORT CIRCUIT TO
GROUND. OVERRATING CHIP TEMPERA TURE. LOAD DUMP VOLT AGE SURGE. FORTUITOUS OPEN GROUND. VERY INDUCTIVE LOADS
Flexibilityin use: bridgeor stereobooster ampli-
fierswithor without boostrapandwith programma-
ble gain and bandwidth.
Space and cost saving: very low numberof
external components, very simple mounting sys-
tem withno electrical isolation between the pack-
age and the heatsink (one screw only). addition, the circuit offers loudspeaker protec-
tion during short circuitfor one wireto ground.
DESCRIPTION
The TDA2005is classB dualaudio poweramplifier MULTIWATT packagespecifically designedfor
car radio application: power booster amplifiers
are easily designedusing thisdevice thatprovides high current capability (upto 3.5A) and that can
drive very low impedance loads (downto 1.6Ωin
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit Operating Supply Voltage 18 V DC Supply Voltage 28 V Peak Supply Voltage (for50 ms) 40 V(*) Output Peak Current (non repetitivet= 0.1 ms) 4.5 A(*) Output Peak Current (repetitivef≥10 Hz) 3.5 A
Ptot Power Dissipationat Tcase =60°C 30 W
Tstg,Tj Storage and Junction Temperature –40to 150 °C
(*) The max. output currentis internally limited.
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SCHEMATIC DIAGRAM
THERMALDATA
Symbol Parameter Value Unit
Rthj-case Thermal ResistanceJunction-case Max. 3 °C/W
TDA2005
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Figure1: Test and ApplicationCircuit (Bridge amplifier)
Figure2: P.C. Board and ComponentsLayoutof Figure1 (1:1 scale)
BRIDGE AMPLIFIER APPLICATION (TDA2005M)
TDA2005
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ELECTRICAL CHARACTERISTICS (referto the Bridge applicationcircuit, Tamb =25oC, GV= 50dB,
Rth (heatsink)=4o C/W, unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit Supply Voltage 8 18 V
Vos Output Offset Voltage(1)
(betweenpin8 andpin 10)= 14.4V= 13.2V
150 Total Quiescent Drain Current Vs= 14.4V RL =4Ω= 13.2V RL= 3.2Ω
160 Output Power d= 10% f=1Hz= 14.4V RL =4Ω= 3.2Ω= 13.2V RL=3.2Ω Distortion f= 1kHz= 14.4V RL =4Ω= 50mWto 15W= 13.2V RL= 3.2Ω= 50mWto 13W Input Sensitivity f= 1kHz =2W RL =4Ω =2W RL= 3.2Ω Input Resistance f= 1kHz 70 kΩ Low Frequency RollOff(– 3dB) RL= 3.2Ω 40 Hz High Frequency RollOff(– 3dB) RL= 3.2Ω 20 kHz Closed LoopVoltage Gain f= 1kHz 50 dB Total Input Noise Voltage Rg= 10kΩ(2) 310 μV
SVR Supply Voltage Rejection Rg= 10kΩ,C4 =10μF
fripple= 100Hz, Vripple= 0.5V 55 dB Efficiency Vs= 14.4V,f=1 kHz= 20W RL =4Ω= 22W RL= 3.2Ω= 13.2V,f=1 kHz= 19W RL= 3.2Ω Thermal Shut-down Junction
Temperature= 14.4V,RL =4Ω= 1kHz, Ptot= 13W
145 °C
VOSH Output Voltagewith one Sideof
the Speaker shortedto ground= 14.4V RL =4Ω= 13.2V RL= 3.2Ω 2VNotes: 1. For TDA2005M only Bandwith Filter :22Hzto 22kHz.
TDA2005
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Figure5: Distortion versus Output Power
(bridge amplifier)
BRIDGE AMPLIFIER DESIGN
The following consideraions canbe useful when designinga bridge amplifier.
Parameter Single Ended Bridge
Vomax Peak OutputVoltage (before clipping) 1(Vs –2 VCEsat) Vs –2 VCEsatmax Peak OutputCurrent (before clippling) 1− 2VCEsat− 2VCEsat
Pomax RMS Output Power (before clipping) 1
(VS− 2VCEsat)2
2RL
(VS− 2VCEsat)2
2RL
Where: VCEsat= outputtransistors saturationvoltage
VS= allowablesupply voltage= load impedance
Figure3: Output Offset Voltage versus
SupplyVoltage
Figure4: Distortion versus Output Power
(bridge amplifier)
TDA2005
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Voltage and current swings are twice fora bridge
amplifierincomparison with singleendedamplifier. order words, with the sameRL the bridge con-
figuration can deliveran output power thatis four
times the output powerofa single ended amplifier,
while, with the same max output current the bridge
configuration can deliveran output power thatis
twice the output powerofa single ended amplifier.
Core mustbe taken when selecting VS andRLin
orderto avoidan output peak current above the
absolute maximum rating.
From the expression for IOmax, assuming VS 14.4V and VCEsat= 2V, the minimum load that
canbe drivenby TDA2005in bridge configuration:min=VS− 2VCEsat
IOmax = 14.4−4
3.5 = 2.97Ω
The voltagegainof thebridge configurationisgiven (see Figure 34):=V0 =1+ R1⋅R4+R4 R3
Forsufficiently high gains(40to 50dB) itis possible putR2 =R4 andR3 =2 R1, simplifing theformula: =4 R1 (dB) R1 (Ω)R2 =R4 (Ω)R3 (Ω)
Figure6: Bridge Configuration
Figure7: Typical ApplicationCircuit
STEREO AMPLIFIER APPLICATION (TDA2005S)
TDA2005
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ELECTRICAL CHARACTERISTICS (referto the Stereo application circuit, Tamb =25oC, GV= 50dB,
Rth (heatsink) =4o C/W, unless otherwwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit Supply Voltage 8 18 V Quiescent Output Voltage Vs= 14.4V= 13.2V
7.2 Total Quiescent Drain Current Vs= 14.4V= 13.2V
120 Output Power (each channel) f= 1kHz,d= 10%= 14.4V RL =4Ω= 3.2Ω =2Ω= 1.6Ω= 13.2V RL= 3.2Ω= 1.6Ω= 16V RL =2Ω
6.5 Distortion (each channel) f= 1kHz= 14.4V RL =4Ω= 50mWto 4W= 14.4V RL =2Ω= 50mWto 6W= 13.2V RL= 3.2Ω= 50mWto 3W= 13.2V RL= 1.6Ω= 40mWto 6W
0.3 Cross Talk(1) Vs= 14.4V,Vo =4VRMS =4Ω,Rg =5kΩ= 1kHz= 10kHz Input Saturation Voltage 300 mV Input Sensitivity f= 1kHz,Po =1W =4Ω= 3.2Ω
5.5 Input Resistance f= 1kHz 70 200 kΩ Low Frequency RollOff(– 3dB) RL =2Ω 50 Hz High Frequency RollOff(– 3dB) RL =2Ω 15 kHz Voltage Gain (open loop) f= 1kHz 90 dB Voltage Gain (closed loop) f= 1kHz 48 50 51 dBGv Closed LoopGain Matching 0.5 dB Total Input Noise Voltage Rg= 10kΩ(2) 1.5 5 μV
SVR Supply Voltage Rejection Rg= 10kΩ,C3 =10μF
fripple= 100Hz, Vripple= 0.5V 45 dB Efficiency Vs= 14.4V,f= 1kHz= 6.5W RL =4Ω= 10W RL =2Ω= 13.2V,f= 1kHz= 6.5W RL= 3.2Ω= 100W RL= 1.6Ω
Notes: 1. ForTDA2005Monly Bandwith Filter :22Hzto 22kHz.
TDA2005
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Figure10: Distortion versus Output Power
(Stereo amplifier)
Figure8: Quiescent Output Voltage versus
SupplyVoltage (Stereo amplifier)
Figure9: Quiescent Drain Current versus
Supply Voltage (Stereo amplifier)
Figure11: Output Power versus Supply Voltage
(Stereo amplifier)
Figure12: Output Power versus Supply Voltage
(Stereo amplifier)
Figure13: Distortion versus Frequency
(Stereo amplifier)
TDA2005
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Figure14: Distortion versus Frequency
(Stereo amplifier)
Figure15: Supply Voltage Rejection versus C3
(Stereo amplifier)
Figure16: SupplyVoltage Rejection versus
Frequency(Stereo amplifier)
Figure17: Supply Voltage Rejection versus and C3 (Stereo amplifier)
Figure18: SupplyVoltage Rejection versus and C3 (Stereo amplifier)
Figure19: Gain versus Input Sensitivity
(Stereo amplifier)
TDA2005
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Figure20: Gain versus Input Sensitivity
(Stereo amplifier)
Figure21: Total Power Dissipation and Effi-
ciency versus OutputPower
(Bridge amplifier)
Figure22: Total Power Dissipation and Effi-
ciency versus Output Power
(Stereo amplifier)
TDA2005
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Partno	Mfg	Dc	Qty	Available	Descript
TDA2005	ST	N/a	527	avai	20W BRIDGE AMPLIFIER FOR CAR RADIO